Name three methods generally used in green chemistry.

Explanation

### Step-by-Step Solution:

1. **Identify the Concept of Green Chemistry**:
Green chemistry is a branch of chemistry focused on designing chemical products and processes that reduce or eliminate the use and generation of hazardous substances. It aims to create sustainable practices in chemical research and industry.

2. **List the Methods Used in Green Chemistry**:
There are various methods employed in green chemistry, but the question specifically asks for three.

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